You manage a cloud service that supports features hosted by two instances of an Azure virtual
machine (VM). You discover that occasional outages cause your service to fail. You need to
minimize the impact of outages to your cloud service. Which two actions should you perform? Each
correct answer presents part of the solution.

A.
Deploy a third instance of the VM.

B.
Configure Load Balancing on the VMs.

C.
Redeploy the VMs to belong to an Affinity Group.

D.
Configure the VMs to belong to an Availability Set.

Explanation:
Adding your virtual machine to an availability set helps your application stay available during
network failures, local disk hardware failures, and any planned downtime. Combine the Azure Load
Balancer with an Availability Set to get the most application resiliency. The Azure Load Balancer
distributes traffic between multiple virtual machines.
http://azure.microsoft.com/en-gb/documentation/articles/virtual-machines-manage-availability/